.login_div{
    width:15rem;margin: 30rem auto;;
}
body{background-image:url(/public/images/beijing.png);background-position:top center;
background-repeat:no-repeat;background-size: 80rem 60rem;height:100%;overflow:hidden;}
.login_span{font-size: 1.2rem;}
.login_sub{
    text-align:center;
}
.error{
    color:red;
}

